George sinclair



(No Model.)

G. SINCLAIR. APPARATUS FOR SUPERHEATING STEAM.

No. 559,624. Patented May 5, 1896.

M. PHOTO-m0 WASMINGTDN, D C.

UNITED STATES PATENT OFFICE.

GEORGE SINCLAIR, OF LEITI-I, SCOTLAND.

APPARATUS FOR SUPERHEATING STEAM.

SPECIFICATION forming part of Letters Patent No. 559,624, dated May 5, 1896.

Application filed December 26, 1895. Serial No. 573,368. (No model.) Patented in England August 3,1894,N0.14,874.

To aZZ whom it may concern:

Be it known that I, GEORGE SINCLAIR, a subject of the Queen of Great Britain and Ireland, and a resident of Leith, in the county of Mid-Lothian, Scotland, have invented certain Improvements in Apparatus for Superheatin g Steam, (for which I have obtained a British patent, No. 1l,874., dated August 3, 1894,)013 which the following is a specification.

My said invention has for its object to improve the construction and arrangement of apparatus for superheatin g steam and to apply for such purposes in a better manner than heretofore some of the heat remaining in the firegases of a steam-boiler after they have acted on the main parts of the boiler itself.

In carrying out my invention I employ long lengths of comparatively small tubingsay of from one to two inches in diameter and I have each length bent into zigzag loops to form a sheet-like section, such as will lie upon or against a flat surface, but with openings through the loops. The tube of each section or sheet has flanges at its ends for bolting to flanges on a main inlet-pipe and a main outletpipe, and a number of the tubular sections or sheets are grouped together and are placed horizontally in one or more flues or spaces through which the the gases pass.

In order that my said invention and the manner of performing the same maybe properly understood, I hereunto append a sheet of explanatory drawings, to be hereinafter referred to, and showing an example of my improved apparatus.

Figures 1 and 2 of the drawings are an elevation and a vertical section, as at right angles to each other, of the apparatus as applied to a marine boiler. Fig. 3 is a plan of one tubular section and the main inlet and outlet pipes.

In the drawings the same reference-letters are used to mark the same or like parts wherever they are repeated.

In my apparatus, shown as applied to a horizontal cylindrical boiler with return firegas tubes, there is for superheating the steam a group of the tubular sections or sheets placed in the uptake V of the boiler, and each section consists of a length of small tubing A, bent into zigzag loops with openings through them. Each tube A has flanges B and C at its ends for bolting to flanges on the main inlet-pipe D and a main outlet-pipe F. Steam is admitted from the boiler into the main inlet-- pipe D by means of a pipe Gr, provided with a stop -valve II, and, passing through the tubes A to a main outlet-pipe F, goes by a pipe J, provided with a stop-valve K, to a main steam-pipe L.

When the tubes A require examination or repair, the steam may be shut ofi from them by means of the stop-Valves II and K and made to pass directly through a stop-Valve M to the main steam-pipe L, and then any tubular section or sheet can be disconnected and withdrawn Without interfering with any other section.

Each tubular section A is horizontal and is carried at the inner ends of the loops on an gle-irons U and at the outer ends on channelirons E, fixed to the uptake-casing.

The tubes A are entered in between the channel-irons E, and each opening is closed by a plate (not shown) fixed by screws.

An important feature of my apparatus is that none of the tube-j oints are exposed to the action of the fire-gases.

lVhat I claim as my invention is- Apparatus for superheating steam, comprising groups of tubes, each of which tubes is bent into zigzag loops to form a sheet-like section, and is bolted to a main inlet and a main outlet pipe, the groups of tubes being placed horizontally in one or more fines or spaces through which the fire-gases pass, but without exposure of the joints to great heat substantially as herein set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- GEORGE SINCLAIR.

lVitnesses 2 EDMUND HUNT,

DAVID FERGUSON. 

